CVE-2025-55409 in FoxCMS
Summary
by MITRE • 08/26/2025
FoxCMS 1.2.6, there is a Cross Site Scripting vulnerability in /index.php/article. This allows attackers to execute arbitrary code.
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Analysis
by VulDB Data Team • 09/10/2025
The vulnerability identified as CVE-2025-55409 affects FoxCMS version 1.2.6 and represents a critical cross site scripting flaw located within the /index.php/article endpoint. This vulnerability stems from insufficient input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before processing and rendering within the web application interface. The flaw enables attackers to inject malicious script code into the application's response, which then executes in the context of other users' browsers when they access the affected page. The vulnerability is classified as a CWE-79: Cross-site Scripting attack, which is a fundamental web application security weakness that allows malicious actors to inject client-side scripts into web pages viewed by other users. This particular implementation flaw exists in the article handling functionality of the CMS, suggesting that any content submitted through the article submission or viewing process could potentially be exploited.
The operational impact of this vulnerability extends beyond simple script execution as it creates a persistent threat vector that can be leveraged for various malicious activities. Attackers can utilize this XSS flaw to steal session cookies, perform unauthorized actions on behalf of authenticated users, redirect victims to malicious websites, or even establish persistent backdoors within the application environment. The vulnerability's ability to allow arbitrary code execution makes it particularly dangerous as it can serve as a stepping stone for more sophisticated attacks including privilege escalation, data exfiltration, or complete system compromise. From an attacker's perspective, this vulnerability provides a reliable method for establishing initial access and can be combined with other exploitation techniques to create more severe security breaches. The attack surface is particularly concerning given that it affects a core content management functionality that likely handles user-generated content and article submissions.
Mitigation strategies for CVE-2025-55409 should focus on implementing robust input validation and output encoding mechanisms throughout the application's data flow. The most effective immediate solution involves sanitizing all user inputs before processing them within the application, particularly data submitted through the article endpoint. Implementing proper Content Security Policy headers can provide additional protection against script injection attempts by restricting the sources from which scripts can be loaded. Regular security audits and code reviews should be conducted to identify similar vulnerabilities within the application's codebase, as this flaw likely indicates broader input validation issues. The vulnerability aligns with ATT&CK technique T1566.001: Phishing, as attackers could use this vulnerability to deliver malicious payloads through compromised article content. Organizations should also implement web application firewalls and monitor for suspicious activity patterns that might indicate exploitation attempts. Patch management procedures should be established to ensure timely updates to FoxCMS and all related components, as this vulnerability represents a known security flaw that has likely been addressed in newer versions of the software. The vulnerability demonstrates the critical importance of maintaining up-to-date security practices and proper input validation in web applications to prevent exploitation by threat actors.